Harvesting energy from nature have attracted much attentions especially the direct energy conversion from other power sources (e.g. light, heat, mechanical movement, moisture) into practical electricity. However, many of existing devices always rely heavily on external metal electrodes, and their rigid structure restrains further applications in portable touchless electronics or perceptual artificial skins. Herein, we demonstrate flexible in-plane moisture-electric converter (IPMEC) based on graphene oxide (GO) film for novel touchless interactive platform. An appreciable electric output voltage (~70 mV) and high electrical current density (12 mA cm⁻²) can be autonomously generated with ambient moisture variation on this IPMEC. The planar configuration and integrative laser reduced GO electrodes of IPMEC renders it highly flexibility, and greatly promotes the touchless interface formation between this device and biological moisture sources (e.g., human finger). Based on this, diverse touchless devices have been developed including finger position annunciator for smart artificial skin, touchless switches and even handwriting panel. This work will provide a new pathway for the development of flexible moisture-electric converters and applications in touchless interactive platform for biomimetic or smart electronics.

从大自然中收集能量引起了广泛的关注，特别是从其他动力源（例如光，热，机械运动，湿气）到实际电力的直接能量转换。但是，许多现有设备始终严重依赖外部金属电极，其刚性结构限制了其在便携式非接触式电子设备或可感知的人造皮肤中的进一步应用。在本文中，我们演示了基于氧化石墨烯（GO）膜的柔性面内湿电转换器（IPMEC），用于新型非接触式交互式平台。相当大的输出电压（〜70 mV）和高电流密度（12 mA cm ^-2））可以根据该IPMEC上的环境湿度变化自动生成。IPMEC的平面配置和集成的激光还原GO电极使其具有高度的灵活性，并极大地促进了该设备与生物湿气源（例如人的手指）之间的非接触式界面形成。基于此，已经开发了多种非接触式设备，包括用于智能人造皮肤的手指位置信号器，非接触式开关甚至手写面板。这项工作将为仿生或智能电子的非接触式互动平台中的柔性水分-电转换器的开发和应用提供一条新途径。